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Sorry not to reply until now. I have only just found you request. I only look infrequently here.
Mine is a MkI Hughes periscopic. I would expect them to all have the same
connections with later Mark sextants.
There are three pins in a socket, the centre pin being common (Case, earth).
When looking at the pins from the back of the sextant (eyepiece away from
you) the left pin is 3V for the bubble lighting, and the right pin is 28V DC
for the averager motor. In fact it works from about 12V upwards.
I have a battery holder for two 1.5V cells which plugs straight into the
socket enabling the sextant to be used for single shot sights, hand held,
(heavy!) but without the averager. In fact I stand it on a suitable surface
at the right height.
I have powered the averager from a separate power supply to check it and for
the fun of it, but do not use it in anger for sights.
The power arrangements were designed for use with the aircraft fuselage
mounting and power supply when connected of course.
Douglas Denny.
Chichester England.
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